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E. D. LEAVITT, Jr.

PUMP. No. 380,830. Patented Apr. 3, 1888.

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PUMP. No. 380,330, Patented Apr. 8, 1888.

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UNITED STATES PATENT @EricE.

ERASMUS D. LEAVITT, JR, OF OAMBRIDGEPORT, MASSACHUSETTS.

PUMP.

SPECIFICATION forming part of Letters Patent No. 380,330, dated April 3, 1888.

Application filed October 10, 1887. Serial No. 251,896. (No model.)

To aZZ whom it may concern:

Be it known that I, Enasnus D. Lnnvrr'r, Jr., of Gambridgeport, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Pumps, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to that class of pumps in which a reciprocating plunger is used to force the water through valves to a higher level; and it consists in certain novel features of construction, arrangement, and combination of parts, which will be best understood by reference to the description of the drawings and to the claims to be hereinafter given.

Figure 1 of the drawings represents a pair of pump-cylinders and their plungers illustrating my invention, one of said cylinders and plungers being shown in elevation and the other out in section through the center of the plunger. Fig. 2 is a vertical section on line was on Fig. 1,lookin g toward the other cylinder.

In pumps of large capacity-such as are often required for mining purposes, for pumping sewage, and for various other kindred uses the ability to reduce the height of the pump without diminishing its capacity or increasing the diameter of its plunger, and as a consequence expanding the pump laterally, is often very desirable, and to accomplish this is the object of my invention, and to this end I make the pump barrel or casing in three separate parts, A, A, and A the lower portion, A, having formed therein the water'chamber B, provided with the inlet passages B, and also having the conical recess or cavity 13 to receive the lower end of the plunger 0, said recess beingsurroundcd by the valve-supporting plate B from which the wall of said recess or cavity depends.

The valve-plate B has formed therein a series of openings, a, in each of which is set a valve-seat carrying a suitable valve. Said valve and seat are not sh own in the drawings, as they form no part of my present invention.

The part A is the pump-barrel proper, made in the present instance oval in crosssection, open at its lower end, and provided at its upper end with the valve-supporting plate D and the cylinderD', pendent therefrom and open at both ends, as shown.

The valve-plate D has formed therein a series of openings, in each of which is set a suitable valveseatand valve, (notsl1own.)and said plate and the pendent cylinder D are stayed by theribs D" and braces D and the shell of the barrel is strengthened by the annular ribs 11 b, and is also provided with the man-hole D, closed by the cover D, as shown.

The upper section,A",of the casing is a hollow casting open at its bottom side and pro vided with the flange a as a means of bolting it to the section A to form the upper valvecharnber, E, through which the water is dis charged. The section A is also provided with the discharge-orifice E,the manhole E, closed by the cover E", and thcstufling-box E, the body of which projects downward nearly its whole length into the chamber E, as shown.

The lower portion of the stuifing-box and the whole length of the cylinder D have fitted therein bushings or linings d and d, respectively, in theinner surfaces of which are formed a series of annular grooves to serve as a waterpacking, in a well-known manner.

A differential plunger made in two parts, F and F, and bolted together is fitted to bearings in the cylinder D and the stuffing-box Efland is reciprocated therein in any wellknown manner. The lower section, F, of said plungerisin the form of a cylinder, having an open upper end and its lower end made conical or tapered nearly to apoint and closed tight,and is provided upon its inner surface with the inweirdly-projecting flange, 6, located about onethird of the length of the straight cylindrical portion thereof from its open upper end. The upper section, F, of said plunger is astraight cylinder provided at its lower end with the flange e, by which and suitable bolts (see Fig. 2) it is secured to the flange e of the section F, as shown.

Apair of pumps areshownin Fig. 1,designed to be operated by an engine having one vertical cylinderand one cylinder somewhat inclined to a vertical line, the right-hand plunger of said pair of pumps being driven by means ofa rod firmly secured to the upper end of the plunger at one end and to the cross-head of the vertical engine at the other, while the plunger of the left-hand pump, in order to obtain the desired vertical movement thereof, is operated by a connecting-rod the upper end of which is connected to a wrist-pin projecting from the working-beam of the engine, and the lower end of which is connected to the wrist-pinf near thebottom of the section F of the plunger, the upper end of said section being open in the form of a trunk-piston. as shown. The area of the recess or pocket B is considerably greater than the area of a cross-section of the larger section, F, of the plunger, so that as said plunger descends into said recess the water contained therein is forced upward around said plunger above the level of the valve-plate B WVhen the plunger is at the extreme of its upward movement, the upper end of the lower or larger section of the plunger will surround and inclose the pendent portion of the stuffing'boX E. By this construction I am enabled to very materially reduce the height of the pump without diminishing its capacity or shortening the stroke of the plunger.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. In a single-acting plunger pump, a plunger composed of two separate hollow cylinders of different diameters, the larger section having one closed end and one open end, and the smaller section projecting into the larger section and being secured to said larger section at a pointwithin the same and somedistance from its open end,and awrist-pin located in said smaller section near its attachment to said larger see tion, in combination with a packing-box bearing for said smaller section projecting into the upper or discharge water-chamber and having an exterior diameter less than the interior diameter of the larger section of the plunger.

2. In'asingle-acting plunger-pump, the combination of a pump barrel or casing, an annular inlet-valve plate at one end thereof proger-guiding cylinder and extending to the dis- U charge-valve plate, a plunger composed of two hollow cylinders of different diameters and secured together at a point within the larger section and some distance from its open end, said larger section having its lower or working end closed and made conical or tapering to enter the pocket pendent from the inlet-valve plate, a wrist-pin located within and near the lower or inner end of the smaller section of said plunger to receive the connecting-rod, and a waterchamber located above the dischargevalve plate and provided with a packing-box projecting into said chamber and having an exterior diameter less than the interior diameter of the larger section of the plunger.

In testimony whereof I have signed my name 7 to this specification, in the presence of two subscribing witnesses, on this 24th day of Septemher, A. D. 1887.

E. D. LEAVITT, JR.

\Vit nesses:

N. G. LOMBARD, WVALTER E. LOMBARD. 

